A 20-26cc size gas motor will work on this plane just fine, but your really not going to get a fuel powered motor to fit in the cowl without cutting of some form..at least for the larger muggler required of most gas engines. The retract mount hard points are a little soft. Reinforce the wood there and you'll be fine. The wings I think are fully sheeted, but the balsa sheeting is quite thin.

As for the pushrods for the elevator and rudder. I did NOT use the carbon fiber tubes as described in the manual. What I did was simply use them as pushrod guides for 4/40 pushrods with flex tubing inside the carbonfiber rods.